That plan breaks down when you read the service agreement . At least for Comcast any pretty much any other large provider. Did you know on Comcast you are supposed to be paying extra for hooking two PC's up to the modem in your home, much less selling the internet to multiple houses? Most everyone gets away with it since the router shows up as one device to the modem.
I don't know if they offer bulk packages to apartment owners at all... everyone I know with an apartment gets service directly through Comcast, not their landlord.